Journal of Ecology and Environment

The Ecological Society of Korea (한국생태학회)
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The Effects of Thinning on Fine Root Distribution and Litterfall in a Pinus koraiensis Plantation

  • Park, Byung-Bae (Division of Forest Restoration, Korea Forest Research Institute) ;
  • Lee, Im-Kyun (Division of Forest Restoration, Korea Forest Research Institute) ;
  • Yang, Hee-Moon (Division of Forest Ecology, Korea Forest Research Institute)
  • Published : 2009.08.31
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Abstract

The purpose of this study was to investigate the effects of thinning on fine root biomass and vertical distribution. and litterfall amount in a 50 year old Pinus koraiensis plantation in Chuncheon, Kangwon Province. Fine root (< 2 mm in diameter) biomass ($367\;g/m^2$) in the site 'OC_75', thinning once in 1975, was 68% of those in the site 'CON', no thinning after planting, and in the site 'TC_00', thinning twice in 1975 and 2000. There were no significant differences of dead roots among treatments. Diameter $0{\sim}1\;mm$ roots were vertically decreased only in the TC_00 site. The litterfall was very similar between OC_75 ($5.2\;Mg\;ha^{-1}\;yr^{-1}$) and TC_00 ($4.7\;Mg\;ha^{-1}\;yr^{-1}$), but the composition of litterfall was different: The proportion of leaves and branches was 80% and 13% in OC_75 and 56% and 36% in TC_00, respectively. Reduction of P. koraiensis density by thinning decreased leaf litter as well as fine roots of P. koraiensis, but increased fine roots production by neighboring understory plants offset the reduction of fine roots of P. koraiensis. We suggest that belowground as well as aboveground responses, including both over- and understory vegetation, should be considered to measure the responses of trees in thinned forest ecosystems.

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References

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